Swaging press



May 13', 1924.4

Y K. BHLE SWAGING' PRESS Filed Nov. 2'7. 1920 Patented May 13, 1924.

`marmo STATES PATENT l KARL BHLE, or ESSEN-auna, GERMANY, A ssIGNoR ToFRIED.. ,KRUPP` .A K'rrniv-v GESELLSCHAFT, oF `ESSEN-ONPHE-iwan,GERMANY.

swAeING rnnss.

Application led November 27, 1920. Serial No. 426,846.

(GRANTEVDUNDER THE PROVISIONS F 0F MARGHB, 1921, 41 STAT. Ii., 1313.) l

tain new and useful Improvement in Swagdown on the sheet, and keeps'theouter edge ing Presses (for which I filed an application in Germany onFebruary 27, 1919),*of

which the followingfis a specification.

This invention relates to vswaging-presses for providing sheet metalplates ,with flanged sockets. More particularly it is an object of thisinvention to produce a; press of the kind specified which will aordr thepossibility of manufacturing such socketsy in the course of asingleworki'ng operation in suchwise that the Asocket on one lof itssides will obtain, practically, cylindrical shell surface.

Two embodiments ofthe subject` matter of this invention are shownbywayof example in the accompanying drawing, in whichy Figs. l to 3 areaxiall longitudinal sections of the kparts of one ofthe known types ofpresses entering into consideration, Figs. 4 and 5 similar views of apress constructed in accordance with the present invention, andl i 1Fig. 6 a similar view o'f-'a modified.' form of construction.

As maybe known when machining the flanged sockets of sheet metal plates,the sheet A, heated it may be t0 a red heat and provided with acircularfcut a1 (Fig. l) is primarily placed on the `dieB of theswaging-press in such a manner that the centre of the opening al willcome-to be disposed within the longitudinal axis of' the ress.iiperation, before theA stamp C strikes against the sheet A, the holderC* bears of the sheet firmly down on thej die B, whereupon the sheet isforced into saidfdie by the action of the stampl C. The sheet is thusbulged in first of allby the lowering of the stamp in the manner shownin Fig. 2. This bulged portion vofthe sheet possesses a comparativelyslight curvature, and this curvature the sheet seeks to retain in thecourse of the subsequent pressing opera-` tion. Besides'this, the socketobtainsa reobtain.

`an accurately Now inthe course of the pressing" duction in the platevthickness Vwhichwi'ncreases toward' its unattached end, 4this reductionof plate thickness corresponding tothek increase which every `diameterof a -circle described on the sheet A concentrically to the longitudinalaxis ofthe swagingpress prior to theshaping of the socket will Thisreduction of platejthickness conjointly with, the tendency proper to theysheetrto' retain, las above said, at its bulgedin section a possibilityslight curvature, re-

sults that when the pressing operation has "terminated there will becreated a clearance (Fig. intermediate the socket a2 (which is adaptedto fill, the annular clearancebetweenl the pressing members onlyk at itsroot:

see again Fig. 3) andthe shell surfaces of' said two` members, namelythe stamp and vthe die, so that the socket can obtain a cylindrical,shape neither along its innerz nor its outer" face. (As, however, inthe .case of flanged sockets of this particular. kind,

which are intended, say for steam: boiler ends to secure the Hue-tubes,at least one ofthe shell surfaces confining the socket must obtain acylindricalface it? is necessary by means of a special working opera-Ytion to give' to jthe one of the shell surfaces of the socket therequired cylindrical shape. It is the special object of' thisinventionto render this 'additional working I operation unnecessaryandthis by very simple means. Y i In the first form of execution disclosedlyingin the samev axialvplaneandappertaining to the outer and innershellsurfaces' of the' flanged socket, which Vangle results from thereduction of the platethickness towardthe free end ofthe socket. A Whenthe stamp descends, the work A is likewise primarily bulged in theymanner shown in Fig. 2. In the further course of the pressin operation,however, owing to the particu ar shape given tothe pressing membersthere can be formed no clearance intermediate the material of the socketa2 and the shell surfaces of the pressing members D and E, inconsequence of Whichthe internal shell surface of the llange will obtaina cylindrical form Without any subsequent machining being-required.

In the second form of execution diagrammatically. showmin Fig.6,.-the,stamp vconsists of a steel ring G slotted obliquely. The plateholder is designated by G1. The portion of the vdie adapted to beapplied vtolthe outer-*shell surface of the 'flangedsocket consists of a#rigid ring H, V'the internal shell lface of which lpossesses the sameV'shape Ias lthat according to the construction shown in SFi'gS. 4 v.and-5. The 'dimensions of the obliquely slotted ring G are so chosen thatwhen subjected :to no pressure, yi. ye. -when .atthe slot portion thesurfacesof separation g2 and Ig3 are at the greatest Vdistance the `oneifrom the other, its radius Will be somewhat larger than-the radius ofthe cylindrical shell surface whichfthe :socket z2 isto obtainalong itsinternal lface.

'When fthe stamp is lowered,the 'resilient ring YG is first of allpressed together in a radial direction for such an extent ythat litsradius will be equal lto fthe radius of the cylindrical shell surface tobe given to ythe socket on 'its'inne'r face. As the pressing operationproceeds, ring G acting under -pressure bears against the internal shellsurface of the flange a2 in making -With the Aresult that this latterwill definitely obtain a cylindrical internal face.

Both in the form of'execu'tion according f to Figs. 4 and 5, as Well asin that according to Fig. '6 it is assumedl that the socket vshallobtain the cylindrical shell surface along its internal face; it is,however, obvious that the sWaging-'press constructed vin accordance withthis invention may be so modified that the socket will obtain thecylindrical shell surface along its outer face. Such a form ofconstruction will be readily obtained, for

example. in 'the form of construction shown holder for entering saidannular die member` lthe portions of said stamp and said die memberadapted to 'be applied to the shell surfaces ofthe flanged socket beingprovided,

the one with a cylindrical, and the other with a conical shellsurface,the lineof this conical shell surface being suitably inclined inaccordance with the automatic reduction in thickness of plate which theflanged socket suffers inthe course ofthe pressing operation.

2. A swaging press for making flanged sockets abutting from sheet metalplates comrprising an annular die member, a plate holder cooperatingWith the front portion of said annular-diefmember'anda stamp movablerelatively to the annular die member in axial direction independently ofsaid plate holder for entering said yannular die'member, the portionsofsaid AStamp and said die member Aadapted to be applied to the shellsurfaces yof the lflanged socket being lprovided, the one With acylindrical, `and the other -With a coni-cal shell surface, the vlinesof this -conical surface 'being suitably inclined ,in accordance Withthe automatic reduction in thickness of plate which fthe flanged socketysuffers in the course of the `pressing operation, the particularportion `of fthe one of the tivo 4pressingl `members adaptedito beYapplied to the sides of the flanged rsocket being `Jformed by aresilient, slotted ring.

3. A fswaging press comprising male v4and female members and a separatemeans for holding kthe Work fast peripherallyab'out the female member,one of the members'being of cylindrical `outline andthe mating amemberbeing of conical outline, the inclination of the two :outlines beingsuch as to auto- `matically accordwith the Ireduced thickness of theWork to "be swaged Vwhen said Workis yoriginally perforated centrally.

4. A swaging press comprising male and female members, one o f saidmembers feomprising a=resilient die'member and a separate means forholding the work fast peripherally about the female member` one of themembers being of cylindrical ouftfline tand the mating member being ofconical outline, the inclinationy of ythe two outlines being such as toautomatically accord with the reduced thickness of the Work to be swagedfor perforated plate.

5. A swaging press comprising lmale and female members and a separatemeans for 'holding the work fast peripherally about the female member.one of the members being of cylindrical outline and the mating memlberA,being of conical outline, the inclination of the ,two outlines beingsuch vas *to automatically accord with the reduced thickness of the workto be swagedwhen said Work is originally perforated centrally, `'themale die member being .of such length Aas to pass 'through theperforation in said plate.

6. A swaging press comprising male and female members` one of said'members comprising a resilientdie member vand a sepa- 1,493,516 l y v 3rate means. for holding the work fast pebeing of such length as to passthrough the ripherally about the female member, one of perforation insaid plate.

the members being of cylindrical outline and The foregoing specificationsigned at Esthe mating member being` of conical outline, sen, Germany,this 23rd day of July, .1920. 5 the inclination of the two outlinesbeing KARL BHLE,

such as to automatically accord with the reduced thickness of the Workto be swaged for perforated plate,- the male die member In presence`of'- HANS GofrrsMANN, JOHANN Dncms.

